Safety water-gage



(No Model.)

P. BARCLAY.

SAFETY WATER GAGE. No. 369,904. Patented Sept 13, 1887 v ZZ y' 7 %4ATTORNEYS.

N. PETERS, Phalo-Lvlhagmphcr, Wznhingmm o. c. 4

I drawings, forming-a part of this specification,

lhvrrnn STATES FTCEO PATENT PETER BARCLAY, OF WINTHROP, MASSACHUSETTS.

SAFETY WATER GAG E.

SPECIFICATION forming part of Letters Patent No. 369,904, datedSeptember 13%, 1887.

Application filed May 15. 1886.

To all whom, it may concern.-

Be it known that I, PETER BARCLAY, of Winthrop, in the county of Suffolkand State of Massachusetts, have invented a new and Improved Gage-Cock,of which the following is a full, clear, and exact description.

My invention relates to the construction of a gage-cock wherein theparts are so arranged that the valves will close automatically andprevent the outward passage of steam or water in case the glasssight-tube should be accidentally broken.

Reference is to be had to-the accompanying in which similar figures ofreference indicate corresponding parts in both the views.

Figure 1 is a central sectional view of the upper cock of a water-gage,said cock being constructed in accordance with the terms of. myinvention, and Fig. 2 is a similar view representing the lower part of awatergage.

Referring now to the construction illustrated in the drawings,represents the main body or barrel of a water-gage cock, which ispreferably formed, as illustrated, for direct connection to a boiler, aportion of which is shown at but it will ofcourse be understood that thecock might be connected to the boiler through the medium of a thimble.

The barrel or body of the cock is formed with a valve-seat, 2, and avalve, 3, which is preferably in the form of the frustum of a cone, andwhich is provided with a downwardly-extending guiding-stem, 4:, which isarranged in connection wit-l1 said seat, the stem 4 riding in aproperly-arranged socket, 5.

In connection with the valve arranged as described I employ avalve-setting stem, 6, that projects from the lower end of a screw, 7,said screw being mounted in a properly-arranged socket and entering thevalve-chamher through a stuffing-box, 14, arranged in the ordinarywell-known manner. Upon the outer end of the screw 7 there is ahand-wheel, 15, and, if desired, a spiral spring, 8, may be Serial No.202,275. (No model.)

coiled about the stem 6, which stem is of less diameter than the mainbody of the screw, as clearly shown,so that one end of the spring mayabut against the end of the screw proper, while the other end of thespring will abut against the upper face of the valve 3.

In operation we will suppose that the valves 3 are in the position inwhich they are shown in the drawings*that is, pressed against theirseats 2 by the pressure of the steam or water within the boiler 20.Thenif the screws 7 are advanced so that the lower ends of their stems 6abut against the upper faces of the valves 8, the said valves will bemoved away from their seats 2, thus admitting the steam or water withinthe gage-cock and within the sight tubes 16, and if, after the water andthe steam is so admitted to the sight-tube, the screws 7 are turned towithdraw the stems 61 from the faces of the valves 3, the steam or waterpressure upon each face will be equal, and the weight of the valvesthemselves will prevent the valves from moving to their seats except attimes when the tube 16 breaks, and immediately upon the breaking of suchtube the equality of pressure would be destroyed and the pressure uponthe under faces of the valves would force them forward against theirseats,

thus closing the passage to the glass sight-tube.

The springs 8 aid in holding the valves from their seats; but inpractice I have found that the spring may be entirely dispensed with.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- The combination, with a valve formed with astem, 4, and mounted in a socket, 5, of a cock body or barrel formedwith a seat, 2, a screw, 7, mounted in said body, a stem, 6, carried bythe screw, and a spring, 8, surrounding the stem, substantially asdescribed.

PETER BARCLAY. Witnesses:

' ALBERT B. DUNHAM,

J. FRED. LANG.

